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Abstract
A new electron monitor unit (MU) calculator program called “eMUc” was developed to provide a convenient electron MU calculation platform for the physics and radiotherapy staff in electron radiotherapy. The program was written using the Microsoft Visual Basic.net framework and has a user‐friendly front‐end window with the following features: (1) Apart from using the well‐known polynomial curve‐fitting method for the interpolation and extrapolation of relative output factors (ROFs), an exponential curve‐fitting method was used to obtain better results. (2) A new algorithm was used to acquire the radius in each angular segment in the irregular electron field during the sector integration. (3) A comprehensive graphical user interface running on the Microsoft Windows operating system was used. (4) Importing irregular electron cutout field images to the calculator program was simplified by using only a commercial optical scanner. (5) Interlocks were provided when the input patient treatment parameters could not be handled by the calculator database accurately. (6) A patient treatment record could be printed out as an electronic file or hard copy and transferred to the patient database. The data acquisition mainly required ROF measurements using various circular cutouts for all the available electron energies and applicators for our Varian 21 EX linear accelerator. To verify and implement the calculator, the measured results using our specific designed irregular and clinical cutouts were compared to those predicted by the calculator. Both agreed well with an error of ±2%.PACS number(s): 87.53.Fs; 87.53.Hv; 87.66.‐a
Highlights
IntroductionBe either the depth of maximum dose (dm) or a reference depth (dref) defined by the AAPM TG51 protocol.[5] Typically, the LINAC is calibrated at the reference point in water using a 10 × 10 cm applicator and cutout at source-to-surface distances (SSDs) = 100 cm to obtain 1 cGy/monitor unit (MU) with an acceptable uncertainty of ±2%.(6) determining the relative output factors (ROFs) for a specific treatment is the first step in calculating the dose per MU for the electron radiotherapy
53 Chow et al.: A graphical user interface for an electron monitor unit calculator...be either the depth of maximum dose or a reference depth defined by the AAPM TG51 protocol.[5]
The aim of this paper is to present a clinical in-house electron monitor unit (MU) calculator called “eMUc.” This calculator program uses the sector-integration algorithm to predict the relative output factors (ROFs) of an irregular electron field and calculates the MU
Summary
Be either the depth of maximum dose (dm) or a reference depth (dref) defined by the AAPM TG51 protocol.[5] Typically, the LINAC is calibrated at the reference point in water using a 10 × 10 cm applicator and cutout at SSD = 100 cm to obtain 1 cGy/MU with an acceptable uncertainty of ±2%.(6) determining the ROF for a specific treatment is the first step in calculating the dose per MU for the electron radiotherapy. The AAPM TG-70 protocol suggests using the lateral buildup ratio based on the pencil beam model, which separates the applicator factors from the in-phantom scatter contribution by measuring the fractional depth dose normalized to the surface. The calculator program should be reliable, user-friendly, accurate, and compatible with the most common personal computer operating system— Microsoft Windows—so that all radiation oncology staff will find it easy to use
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